Patch "Drivers: hv: get rid of timeout in vmbus_open()" has been added to the 4.4-stable tree

Patch "Drivers: hv: get rid of timeout in vmbus_open()" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Drivers: hv: get rid of timeout in vmbus_open()

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drivers-hv-get-rid-of-timeout-in-vmbus_open.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 396e287fa2ff46e83ae016cdcb300c3faa3b02f6 Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Thu, 9 Jun 2016 17:08:56 -0700
Subject: Drivers: hv: get rid of timeout in vmbus_open()

From: Vitaly Kuznetsov <vkuznets@redhat.com>

commit 396e287fa2ff46e83ae016cdcb300c3faa3b02f6 upstream.

vmbus_teardown_gpadl() can result in infinite wait when it is called on 5
second timeout in vmbus_open(). The issue is caused by the fact that gpadl
teardown operation won't ever succeed for an opened channel and the timeout
isn't always enough. As a guest, we can always trust the host to respond to
our request (and there is nothing we can do if it doesn't).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hv/channel.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -73,7 +73,6 @@ int vmbus_open(struct vmbus_channel *new
 	void *in, *out;
 	unsigned long flags;
 	int ret, err = 0;
-	unsigned long t;
 	struct page *page;
 
 	spin_lock_irqsave(&newchannel->lock, flags);
@@ -183,11 +182,7 @@ int vmbus_open(struct vmbus_channel *new
 		goto error1;
 	}
 
-	t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ);
-	if (t == 0) {
-		err = -ETIMEDOUT;
-		goto error1;
-	}
+	wait_for_completion(&open_info->waitevent);
 
 	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
 	list_del(&open_info->msglistentry);


Patches currently in stable-queue which might be from vkuznets@redhat.com are

queue-4.4/drivers-hv-get-rid-of-timeout-in-vmbus_open.patch
queue-4.4/drivers-hv-don-t-leak-memory-in-vmbus_establish_gpadl.patch